Paper-tube machinery.



G. P. JENKINS.

PAPER TUBE MACHINERY.

APPLICATION TILED SEPT.15,, 1910.

Patented Feb. 14, 1911. I

1 6 fw f witnesses UNITED *srArEs PATENT ornro eIiAnLEs FRANCIS JENKINS,[or WASHINGTON, DISTRICT or continua.

rnrnnrrunn .MACHINERY.

Application filed September 15, 1910. Serial No. 582,276.

Specification of Letters Patent.

. Patented To all whom it may concern:

Be it known that'I, CHARLES FRA GIs JENKINS, citizen of the UnitedStates,-residing 'at Washington, Districtof Columbia, have inventedcertain new and useful Improvements in Paper-Tube Machinery, of

g whichthe following isa specification.

This invention relates to improvements in tubewinders, and has for itsmain object a more effective grip on the paper by the feeding belts. 1

Tubewinders are usually made with a sta- 'tionary nonrotat-ing mandreland one or more driving belts lapped around this mandrel, the paper tubebeing formed between the two. The feeding traction on the paper, toadvance it, is the difference in the amount a of friction between thestationary surface of the mandrel, which resists, and which is kept assmooth as possible to make the re-.

enough to pull the paper along but overcome' the drag of the paperthrough the gluing device. With thin paper this difierence falls toalmost nothing, under the best conditions, so that extreme care must bemaintained to keep'the machine operative.

The object of this invention is to increase this difference ofresistance, i. e., the resistance to movement: by the paper in contactwith the mandrel, and the tractive force of the belt on the largerdiameter of the outside .of the tube, by decreasing the amount offrictional resistance on the mandrel, and is accomplished by providing agrip on the inside of the paper tube. This is effected by arrangingone-or more rows of balls spirally around the mandrel so that the topsof the b ll s and a li tle g e h n t e s f f 1a mandrel B,

' paper. slstance ward with a force :pieces if it is held the mandrel,with means for returning the alls from the end of the raceway back tothe beginning of it, as shown in the draw ings, in which- Feb. It, ran.

Figure 1 is a top view of the common form of tubewinder; Fig. 2 a sideView of a section of the mandrel underone or both of the winding belts,and concealed thereby; and Fig. 3 avertical section of the same portionof the mandrel. I

In the figures, A is'a supporting frame for around which belts C arewrapped.

D and D are balls in two channels or race ways arranged spirally aroundthe mandrel,

beginningfat the underside of the mandrel as at-D and D and ending on toof the mandrel as at. D and D after ma ing one I and one-half turnsaround the mandrel. At

this point the balls drop through the mandrel wall into the upper end ofan inclined raceway E by means'of which they are returned to thebeginningof the spiral.

As the top 'of the balls are higher than the surface of the mandrel andlie under the belt it is obvious that the belt will bear hardest on theballs, andthat paper running between the balls and the belt will befirmly gripped between them and driven forward, around the mandrel, witha tractionamounting practically to a positive grip on the on the insideof. the formed and forming tube is greatly reduced, and at the sametimethe tractive eflect of the belts is multiplied, so that the paperisdriven for from tlfe mandrel. The method of laying the paper on themandrel, as well as the method of form the paper tube, are so familiar.to those skilled in the art that an illustration of just how paper iswound on these'mandrels 1s believed unnecessary In other words, thefrictional resufficient to. tear it in i at some point distant I gluingup the several layers'to and it is therefore ered mechanicalequivalents,

and the word balls only is therefore used.

What I claim, is-

5 1. Inv a tube-winder,

spiral raceway therein, rolling 2. In a tube-winder,

. spiral raceway therein, 1 balls in said raceway. 3. In a tube-winder,

a mandrel having a and. a plurality of members in said raceway.

a mandrel having a and a plurality of a mandrel having a balls insaidraceway, Ithe balls extending slightly beyond the surspiral racewaytherein, and a plurality of the exposed portion of face of the mandrel.15 In testimony whereof I have aflixed my signature in presence of twowitnesses.

CHARLES FRANCIS JENKINS.

VVit-nesses I G. L. JENKINS A. M. PARKINS.

